From bb5cb79bd1736fc33f5959fafed207ca1dd0db6d Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sat, 28 Dec 2019 23:43:08 +1300
Subject: Fix and refactor HTML timestamp updating

---
 vim/autoload/html.vim | 47 ++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 38 insertions(+), 9 deletions(-)

(limited to 'vim')

diff --git a/vim/autoload/html.vim b/vim/autoload/html.vim
index 7ac4f9d3..72f29bb4 100644
--- a/vim/autoload/html.vim
+++ b/vim/autoload/html.vim
@@ -21,19 +21,48 @@ function! html#TidyBuffer() abort
   call winrestview(view)
 endfunction
 
+let s:formats = {
+      \ 'human': '%a, %d %b %Y %T %Z',
+      \ 'machine': '%Y-%m-%dT%H:%M:%S.000Z',
+      \}
+
+function! s:Timestamp(time) abort
+  if exists('$TZ')
+    let tz = $TZ
+  endif
+  let $TZ = 'UTC'
+  let time = localtime()
+  let timestamp = {}
+  for key in keys(s:formats)
+    let timestamp[key] = strftime(s:formats[key], time)
+  endfor
+  if exists('tz')
+    let $TZ = tz
+  endif
+  return timestamp
+endfunction
+
+let s:pattern = '\m\C'
+      \.'Last updated: '
+      \.'<time datetime="[^"]\+">'
+      \.'[^<]\+'
+      \.'</time>'
+
 " Update a timestamp
 function! html#TimestampUpdate() abort
   if !&modified
     return
   endif
-  let cv = winsaveview()
-  call cursor(1,1)
-  let li = search('\m\C^\s*<em>Last updated: .\+</em>$', 'n')
-  if li
-    let date = substitute(system('date -u'), '\n$', '', '')
-    let line = getline(li)
-    call setline(li, substitute(line, '\S.*',
-          \ '<em>Last updated: '.date.'</em>', ''))
+  let lnum = search(s:pattern, 'nw')
+  if !lnum
+    return
   endif
-  call winrestview(cv)
+  let timestamp = s:Timestamp(localtime())
+  let update = 'Last updated: '
+        \.'<time datetime="'.timestamp['machine'].'">'
+        \.timestamp['human']
+        \.'</time>'
+  let line = getline(lnum)
+  let line = substitute(line, s:pattern, update, '')
+  call setline(lnum, line)
 endfunction
-- 
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